diff --git a/binaries/data/mods/public/simulation/components/tests/test_GuiInterface.js b/binaries/data/mods/public/simulation/components/tests/test_GuiInterface.js
index ec96059e08..d68d89562c 100644
--- a/binaries/data/mods/public/simulation/components/tests/test_GuiInterface.js
+++ b/binaries/data/mods/public/simulation/components/tests/test_GuiInterface.js
@@ -44,6 +44,7 @@ AddMock(100, IID_Player, {
 	GetColour: function() { return { r: 1, g: 1, b: 1, a: 1}; },
 	GetPopulationCount: function() { return 10; },
 	GetPopulationLimit: function() { return 20; },
+	GetMaxPopulation: function() { return 200; },
 	GetResourceCounts: function() { return { food: 100 }; },
 	IsTrainingQueueBlocked: function() { return false; },
 	GetState: function() { return "active"; },
@@ -85,6 +86,7 @@ AddMock(101, IID_Player, {
 	GetColour: function() { return { r: 1, g: 0, b: 0, a: 1}; },
 	GetPopulationCount: function() { return 40; },
 	GetPopulationLimit: function() { return 30; },
+	GetMaxPopulation: function() { return 300; },
 	GetResourceCounts: function() { return { food: 200 }; },
 	IsTrainingQueueBlocked: function() { return false; },
 	GetState: function() { return "active"; },
@@ -128,6 +130,7 @@ TS_ASSERT_UNEVAL_EQUALS(cmp.GetSimulationState(), {
 			colour: { r:1, g:1, b:1, a:1 },
 			popCount: 10,
 			popLimit: 20,
+			popMax: 200,
 			resourceCounts: { food: 100 },
 			trainingQueueBlocked: false,
 			state: "active",
@@ -142,6 +145,7 @@ TS_ASSERT_UNEVAL_EQUALS(cmp.GetSimulationState(), {
 			colour: { r:1, g:0, b:0, a:1 },
 			popCount: 40,
 			popLimit: 30,
+			popMax: 300,
 			resourceCounts: { food: 200 },
 			trainingQueueBlocked: false,
 			state: "active",
@@ -163,6 +167,7 @@ TS_ASSERT_UNEVAL_EQUALS(cmp.GetExtendedSimulationState(), {
 			colour: { r:1, g:1, b:1, a:1 },
 			popCount: 10,
 			popLimit: 20,
+			popMax: 200,
 			resourceCounts: { food: 100 },
 			trainingQueueBlocked: false,
 			state: "active",
@@ -193,6 +198,7 @@ TS_ASSERT_UNEVAL_EQUALS(cmp.GetExtendedSimulationState(), {
 			colour: { r:1, g:0, b:0, a:1 },
 			popCount: 40,
 			popLimit: 30,
+			popMax: 300,
 			resourceCounts: { food: 200 },
 			trainingQueueBlocked: false,
 			state: "active",